In my years of being conscious of politics, I’ve observed many terrible mistakes. Suez was a catastrophe, but Anthony Eden and many of his cabinet did believe it was the right thing to do. Labour’s nationalisations of industry — pretty disastrous — were pursued in the belief that socialism would work. The Tory poll tax was an awful idea but its cabinet and parliamentary cheerleaders honestly thought it would prove fair and workable. The Iraq and the Afghan occupations were a costly blunder but I’ve never doubted that Tony Blair believed he was taking the morally right course. David Cameron really expected we could make Libya a better place.
The point actually is that they all believed that what they were doing served British interests somehow, while BoJo and his government either just don't believe that or more likely they knowingly hurt British interests because that's the price of their current status and power. However, that's what the British people really want and voted for, isn't it? Get Brexit done and take back control.